TOŁSTOJ, Lew Nikołajewicz; OJCEWICZ, Grzegorz. Pierwszy szczebel. Zoophilologica. Polish Journal of Animal Studies, [S. l.], n. 1 (13), p. 1–30, 2024. DOI: 10.31261/ZOOPHILOLOGICA.2024.13.01. Disponível em: https://journals.us.edu.pl/index.php/ZOOPHILOLOGICA/article/view/15659. Acesso em: 18 mar. 2025.